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True, hermetically sealed merely means airtight. Obviously there are degrees of air tightness.
The Apogee brochure page 8 says their inner chamber are sealed with Argon gas. The chamber has a lifetime guarantee against condensation.
FLI also does the same although I don't think they offer a lifetime guarantee and say you may need to purge the gas every several years.
STX sounds much the same but has a desiccant plug which perhaps works much like the lower SBIG models and requires baking from time to time.
If it doesn't and is just an added precaution and will operate like the Apogee and FLI in this regard then I stand corrected.
I am not criticising the STX as I think its an awesome camera I'm just pointing out a difference.
Either way its not a big deal but of course if you never need to bake desiccant I think thats a plus. I also wouldn't let it stop me from buying an STX as it has many awesome features the others don't and seems to have nicely closed the gap between these other makers and perhaps gone past them. The different guiding techniques, the accessories and integration, the extra channels. Now the prices have dropped its really good value.
Greg,
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